Property, plant and equipment, net - Summary of Property, Plant and Equipment Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 199,178	$ 187,749
Less accumulated depreciation and amortization	(43,802)	(36,573)
Property, plant and equipment, net	155,376	151,176
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	1,210	1,210
Building
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	15,745	15,664
Computer equipment and software
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	6,837	6,947
Office equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	7,611	7,599
Laboratory equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	47,496	44,560
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	34,019	33,788
Construction-in-progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 86,260	$ 77,981